How to Identify and Measure Fittings
Pipe size is an industry designation, not the actual size. View information about how to measure threaded and unthreaded pipe and pipe fittings.
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How to Measure Fittings
Pipe size is an industry designation, not the actual size. View information about how to measure threaded and unthreaded pipe and pipe fittings.
More
Barbed Flow-Control Orifices
Insert the barbed ends of these orifices into rubber and soft plastic tubing, and secure them with a clamp. Also known as flow restrictors and precision orifice valves, they are used to throttle, vent, bleed, or regulate the flow of liquids and gases.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Argon, Coolant, Diesel Fuel, Gasoline, Mineral Oils, Natural Gas, Oil, Oxygen, Steam, Water
- Max. Pressure: 500 psi @ 70° F
- Temperature Range: Not Rated to 500° F
Available Orifice Diameters | ||
|---|---|---|
| Orifice Dia. | Water Flow | Air Flow |
| 0.01" | 0.016 gpm @ 40 psi | 0.3 scfm @ 40 psi |
| 0.016" | 0.035 gpm @ 40 psi | 0.5 scfm @ 40 psi |
| 0.018" | 0.046 gpm @ 40 psi | 0.6 scfm @ 40 psi |
| 0.02" | 0.056 gpm @ 40 psi | 0.6 scfm @ 40 psi |
| 0.021" | 0.061 gpm @ 40 psi | 0.7 scfm @ 40 psi |
| 0.023" | 0.076 gpm @ 40 psi | 0.7 scfm @ 40 psi |
| 0.024" | 0.082 gpm @ 40 psi | 0.7 scfm @ 40 psi |
| 0.025" | 0.089 gpm @ 40 psi | 0.8 scfm @ 40 psi |
| 0.026" | 0.101 gpm @ 40 psi | 0.8 scfm @ 40 psi |
| 0.028" | 0.114 gpm @ 40 psi | 0.9 scfm @ 40 psi |
| 0.029" | 0.12 gpm @ 40 psi | 0.9 scfm @ 40 psi |
| 0.032" | 0.152 gpm @ 40 psi | 1.1 scfm @ 40 psi |
| 0.033" | 0.158 gpm @ 40 psi | 1.1 scfm @ 40 psi |
| 0.035" | 0.177 gpm @ 40 psi | 1.2 scfm @ 40 psi |
| 0.038" | 0.202 gpm @ 40 psi | 1.2 scfm @ 40 psi |
| 0.04" | 0.228 gpm @ 40 psi | 1.3 scfm @ 40 psi |
| 0.042" | 0.247 gpm @ 40 psi | 1.4 scfm @ 40 psi |
| 0.047" | 0.304 gpm @ 40 psi | 1.5 scfm @ 40 psi |
| 0.052" | 0.373 gpm @ 40 psi | 1.6 scfm @ 40 psi |
| 0.055" | 0.43 gpm @ 40 psi | 1.7 scfm @ 40 psi |
| 0.063" | 0.557 gpm @ 40 psi | 2 scfm @ 40 psi |
| 0.125" | 2.34 gpm @ 40 psi | 4 scfm @ 40 psi |
| For Tube ID | Lg. | Each | |
Barbed × Barbed | |||
|---|---|---|---|
| 1/4" | 1 5/16" | 0000000 | 000000 |
Flow-Control Flange Unions
Measure, throttle, and regulate the flow of liquids and gases in your line by adding an orifice plate to these unions. They consist of two flange halves, plus all of the components needed to connect them together. Tighten the jack bolts to separate the flange halves to inspect or replace the orifice plate.
To throttle flow, mount an orifice plate between the two flanges. The orifice plate restricts the flow in order to regulate it.
To measure flow, build the same assembly, except you’ll also connect a differential pressure gauge or transmitter to both flange halves using the threaded ports. Your gauge or transmitter will measure the difference between the pressure before and after the orifice plate. The pressure difference is proportional to flow rate, so you can use that measurement to calculate your line’s flow rate.
Butt-weld flanges are also known as weld-neck flanges; the flange neck has a beveled end that, when flush to pipe, creates a trough for a strong weld. Slip-on weld flanges have no internal stop; slide a pipe through the flange and weld on both sides.
316/316L stainless steel flanges have excellent corrosion resistance.
Flanges that meet ASME B16.36 adhere to specifications and testing requirements for temperature and pressure ratings, dimensions, materials, and tolerances.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Natural Gas, Oil, Water
- Temperature Range: Not Rated
- Specifications Met: See table
- Pressure Class: 300
- Fittings:
Carbon Steel: Use Schedule 40 steel
316/316L Stainless Steel: Use Schedule 40 stainless steel - Pipe Nipples and Pipe:
Carbon Steel: Use Schedule 40 steel
316/316L Stainless Steel: Use Schedule 40 stainless steel
Bolt Hole | Port | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size  | Construction | Flange OD | For Bolt Dia. | Dia. | No. of | Bolt Circle Dia. | Pipe Size | No. of | Includes | Specifications Met | Each | |
Carbon Steel | ||||||||||||
| 3/4 | Seamless | 4 5/8" | 5/8" | 11/16" | 4 | 3 1/4" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | __ | 0000000 | 0000000 |
| 1 | Seamless | 4 7/8" | 5/8" | 11/16" | 4 | 3 1/2" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 000000 |
| 1 1/2 | Seamless | 6 1/8" | 3/4" | 13/16" | 4 | 4 1/2" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 000000 |
| 2 | Seamless | 6 1/2" | 5/8" | 11/16" | 8 | 5" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 000000 |
| 3 | Seamless | 8 1/4" | 3/4" | 13/16" | 8 | 6 9/16" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 000000 |
| 4 | Seamless | 10" | 3/4" | 13/16" | 8 | 7 7/8" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 000000 |
316/316L Stainless Steel | ||||||||||||
| 3/4 | Seamless | 4 5/8" | 5/8" | 11/16" | 4 | 3 1/4" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | __ | 0000000 | 000000 |
| 1 | Seamless | 4 7/8" | 5/8" | 11/16" | 4 | 3 1/2" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 000000 |
| 1 1/2 | Seamless | 6 1/8" | 3/4" | 13/16" | 4 | 4 1/2" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 000000 |
| 2 | Seamless | 6 1/2" | 5/8" | 11/16" | 8 | 5" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 000000 |
| 3 | Seamless | 8 1/4" | 3/4" | 13/16" | 8 | 6 9/16" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 000000 |
| 4 | Seamless | 10" | 3/4" | 13/16" | 8 | 7 7/8" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 00000000 |
- For Use With: Air, Natural Gas, Oil, Water
- Temperature Range: Not Rated
- Specifications Met: See table
- Pressure Class: 300
- Fittings:
Carbon Steel: Use Schedule 40 steel
316/316L Stainless Steel: Use Schedule 40 stainless steel - Pipe Nipples and Pipe:
Carbon Steel: Use Schedule 40 steel
316/316L Stainless Steel: Use Schedule 40 stainless steel
Bolt Hole | Port | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Flange OD | For Bolt Dia. | Dia. | No. of | Bolt Circle Dia. | Pipe Size | No. of | Includes | Specifications Met | Each | |
Carbon Steel | |||||||||||
| 3/4 | 4 5/8" | 5/8" | 11/16" | 4 | 3 1/4" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | __ | 0000000 | 0000000 |
| 1 | 4 7/8" | 5/8" | 11/16" | 4 | 3 1/2" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 000000 |
| 1 1/2 | 6 1/8" | 3/4" | 13/16" | 4 | 4 1/2" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 000000 |
| 2 | 6 1/2" | 5/8" | 11/16" | 8 | 5" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 000000 |
| 3 | 8 1/4" | 3/4" | 13/16" | 8 | 6 9/16" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 000000 |
| 4 | 10" | 3/4" | 13/16" | 8 | 7 7/8" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 000000 |
316/316L Stainless Steel | |||||||||||
| 3/4 | 4 5/8" | 5/8" | 11/16" | 4 | 3 1/4" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | __ | 0000000 | 000000 |
| 1 | 4 7/8" | 5/8" | 11/16" | 4 | 3 1/2" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 000000 |
| 1 1/2 | 6 1/8" | 3/4" | 13/16" | 4 | 4 1/2" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 000000 |
| 2 | 6 1/2" | 5/8" | 11/16" | 8 | 5" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 000000 |
| 3 | 8 1/4" | 3/4" | 13/16" | 8 | 6 9/16" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 00000000 |
| 4 | 10" | 3/4" | 13/16" | 8 | 7 7/8" | 1/2 NPT | 2 | Gaskets, Jack Bolts, Nuts, Port Plugs, Threaded Rods | ASME B16.36 | 0000000 | 00000000 |
Flow-Control Orifices for Chemicals
- For Use With: Air, Ammonia, Sodium Hydroxide, Beverage, Carbon Dioxide, Diesel Fuel, Water, Oil, Ethylene Glycol, Food, Hydrochloric Acid, Kerosene, Liquid Carbon Dioxide, Methanol, Soap Solutions, Methyl Ethyl Ketone, Mineral Spirits, Natural Gas, Oxygen, Nitric Acid
- Max. Pressure: 120 psi @ 75° F
- Temperature Range: 40° to 140° F
Made of PVC, these orifices have excellent resistance to a wide range of corrosive chemicals. Also known as flow restrictors and precision orifice valves, they are used to throttle, vent, bleed, or regulate the flow of liquids and gases. They automatically adjust to changing inlet pressure to maintain consistent outlet flow.
For technical drawings and 3-D models, click on a part number.